diff --git a/wp-admin/css/wp-admin.dev.css b/wp-admin/css/wp-admin.dev.css
index abe3cb704..a03f7b78d 100644
--- a/wp-admin/css/wp-admin.dev.css
+++ b/wp-admin/css/wp-admin.dev.css
@@ -732,6 +732,7 @@ p.install-help {
 .wp-admin select {
 	padding: 2px;
 	height: 2em;
+	max-width: 100%;
 }
 
 .wp-admin select[multiple] {